关于声现象,下列说法正确的是()A.声波和电磁波一样能在真空中传播B.超声波在空气中的传播速度约是3×108m/sC.成语“声如洪钟”形容说话或歌唱时声音洪亮,它描述的是声音的

时间:2024-04-30 09:15:20 5A范文网 浏览: 平时作业 我要投稿

问题描述:

关于声现象,下列说法正确的是(  )

A. 声波和电磁波一样能在真空中传播

B. 超声波在空气中的传播速度约是3×108m/s

C. 成语“声如洪钟”形容说话或歌唱时声音洪亮,它描述的是声音的响度大

D. 通过居民区的高速铁路加装隔音屏障是为了防止噪声的产生



最佳答案


A、声音的传播需要介质,声音不能在真空中传播,故A错误;
B、超声波也是声波,声波在空气中的传播速度为340m/s,故B错误;
C、成语“声如洪钟”形容说话或歌唱时声音洪亮,它描述的是声音的响度,故C正确;
D、通过居民区的高速铁路需加装隔音屏障是在传播过程中减弱噪音,但不能防止噪声的发生,故D错误.
故选:C.

来源:网络整理 免责声明:本文仅限学习分享,如产生版权问题,请联系我们及时删除。

相关文章:

John has got a bad fever these days, and he says h04-30

— Have you got a ticket for the football match? 04-30

I believe the government regards the H1N1 as an im04-30

The weather being rainy, the school sports meet is04-30

The little boy was found _____in his room the next04-30

His knowledge of French is _____ for the job, alth04-30

Please don't bother me again. I'04-30

After a thorough search, the rescue team finally b04-30

Children are _____ to meet with setbacks (挫折) as04-30

如图所示,倾角为30°的粗糙斜面的底端有一小车,车内有一04-30

热搜文章
最新文章